后端PHP中的表单电子邮件验证

我正在使用表格在我的网站上注册时事通讯。我正在使用一个contact.php文件，该文件运行良好，但没有验证，因此我偶尔会收到空白响应

我不确定这是为什么，但我相信我需要验证

这是我的原始代码

<?php
/*

Author: Andrew Walsh
Date: 30/05/2006
Codewalkers_Username: Andrew


This script is a basic contact form which uses AJAX to pass the information to php, thus making the page appear to work without any refreshing or page loading time.

*/

$to = "hello@interzonestudio.com"; //This is the email address you want to send the email to
$subject_prefix = ""; //Use this if you want to have a prefix before the subject

if(!isset($_GET['action']))




{
die("You must not access this page directly!"); //Just to stop people from visiting contact.php normally
}

/* Now lets trim up the input before sending it */


$subject = "Newsletter Sign Up"; //The senders subject
$message = trim($_GET['email']); //The senders subject
$email = trim($_GET['email']); //The senders email address

mail($to,$subject,$message,"From: ".$email.""); //a very simple send

echo 'contactarea|Thank you. We promise you won’t regret it.'; //now lets update the "contactarea" div on the contact.html page. The contactarea| tell's the javascript which div to update.
?>

像这样：

<?php
/*

Author: Andrew Walsh
Date: 30/05/2006
Codewalkers_Username: Andrew


This script is a basic contact form which uses AJAX to pass the information to php, thus making the page appear to work without any refreshing or page loading time.

*/

$to = "hello@interzonestudio.com"; //This is the email address you want to send the email to
$subject_prefix = ""; //Use this if you want to have a prefix before the subject

if(!isset($_GET['action']))




{
die("You must not access this page directly!"); //Just to stop people from visiting contact.php normally
}

/* Now lets trim up the input before sending it */

if (filter_var($email, FILTER_VALIDATE_EMAIL) === true) {



$subject = "Newsletter Sign Up"; //The senders subject
$message = trim($_GET['email']); //The senders subject
$email = trim($_GET['email']); //The senders email address


mail($to,$subject,$message,"From: ".$email.""); //a very simple send



echo 'contactarea|<div id="thanks">Thank you. We promise you won’t regret it.</div>'; //now lets update the "contactarea" div on the contact.html page. The contactarea| tell's the javascript which div to update.

} else {
  echo("$email is not a valid email address");
}


?>

---

您可以在PHP中使用
filter\u var（）
函数来验证电子邮件地址

为了在PHP中简单地验证电子邮件地址，您可以这样使用它

if(filter_var($email, FILTER_VALIDATE_EMAIL)){
  echo "Valid email";
}

你的代码可以这样改进

if(filter_var($email, FILTER_VALIDATE_EMAIL)){
  mail($to,$subject,$message,"From: ".$email.""); //a very simple send
  echo 'contactarea|Thank you. We promise you won’t regret it.'; //now lets update the "contactarea" div on the contact.html page. The contactarea| tell's the javascript which div to update.
}
else {
  $errormsg.=  "<li class='errormessage'>ERROR: not a valid email.</li>";
  $error++;
  echo '</ul> error|'. $errormsg;
}

if（过滤变量（$email，过滤验证电子邮件））{
mail（$to，$subject，$message，“From:“.$email.”；//一个非常简单的发送
echo'contactarea |谢谢。我们保证您不会后悔。；//现在让我们更新contact.html页面上的“contactarea”div。contactarea |告诉javascript要更新哪个div。
}
否则{
$errormsg.=“
错误：不是有效的电子邮件。
”；
$error++；
回显“错误|”。$errormsg；
}

如果您想了解更多信息，请访问这里的官方PHP文档页面：
或使用jquery验证插件。我极力推荐

代码如下所示

  $( "#myform" ).validate({
   rules: {
   field: {
  required: true,
  email: true
    }
   }
  });

您可以使用以下代码使用服务器端验证

if (filter_var($email, FILTER_VALIDATE_EMAIL) === true) {
  //your email sending code here
} else {
  echo("$email is not a valid email address");
}

我正在尝试：jQuery（document）.ready（function（）{$（“#contactform”）.validate（{rules:{email:{required:true.}}，messages:{email:{required Field}}）；}）；但是我得到一个类型错误：undefined不是一个函数（计算“$”（“#contactform”）.validate“）
  $( "#myform" ).validate({
   rules: {
   field: {
  required: true,
  email: true
    }
   }
  });

if (filter_var($email, FILTER_VALIDATE_EMAIL) === true) {
  //your email sending code here
} else {
  echo("$email is not a valid email address");
}